Turbulent flame speed and self-similar propagation of expanding premixed flames

Swetaprovo Chaudhuri, Fujia Wu, Delin Zhu, Chung K. Law

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A unified scaling of experimental turbulent flame speed data, measured in constant-pressure expanding turbulent premixed flames, propagating in nearly homogenous isotropic turbulence in a dual-chamber fan-stirred vessel is presented. While the cold flow is characterized by high speed particle image velocimetry, the flame propagation rate is obtained by tracking high speed Schlieren images of unity Lewis number methane-air flames over wide ranges of pressure and turbulence intensity. It is found that the normalized turbulent flame speed as a function of the average radius scales as a turbulent Reynolds number to the one-half power, where the average radius is the length scale and thermal diffusivity is the transport property, thus showing self-similar propagation. Utilizing this dependence and recent theoretical results obtained by the spectral closure of the G-equation, it is found that the turbulent flame speeds from expanding flames and those from Bunsen geometries are scaled by the same one half power dependency of the turbulent Reynolds number with appropriate choice of length scales.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
PublisherCombustion Institute
Pages648-658
Number of pages11
ISBN (Electronic)9781622761258
StatePublished - Jan 1 2011
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 - Storrs, United States
Duration: Oct 9 2011Oct 12 2011

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011

Other

OtherFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
CountryUnited States
CityStorrs
Period10/9/1110/12/11

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Mechanical Engineering
  • Chemical Engineering(all)

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  • Cite this

    Chaudhuri, S., Wu, F., Zhu, D., & Law, C. K. (2011). Turbulent flame speed and self-similar propagation of expanding premixed flames. In Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 (pp. 648-658). (Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011). Combustion Institute.